It's a design decision not to add random values to the metadata for the required metadata fields.
If you use the metadata editing interface in Sigil, and enter values for the required items, Sigil ePubs pass epubcheck if you also have valid XHTML in the content.
Quote:
Originally Posted by droople
What I did with Sigil epub file is type in "test" in the text field, without import any external files.
Here is the validation message
ERROR: test.epub/OEBPS/content.opf(6): unfinished element
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